import 'babel-polyfill'

let func = () => {};
const num = 45;
let arr = [1, 2, 1, 3,2,3,4,54,6,76,78,8,899,22,1,23,2,4,2,543];
let arrB = arr.map(item => item * 2);
arr.includes(8);
console.log('new set(arrB)', new Set(arrB))
console.log('includes', arr)

function* func(){

}